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ADTL084ARZ Equivalent & Substitute Parts
Part Overview
The ADTL084ARZ is a J-FET input operational amplifier manufactured by Analog Devices Inc., configured as a 4-circuit integrated circuit in a 14-SOIC surface mount package. This device is classified as a linear amplifier and maintains Active product status. The ADTL084ARZ is suitable for applications requiring low input bias current, low input offset voltage, and moderate bandwidth performance. Equivalent and substitute parts are identified based on matching circuit topology, package compatibility, and electrical performance parameters within acceptable operational ranges.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Manufacturer Part Number | ADTL084ARZ | — |
| Manufacturer | Analog Devices Inc. | — |
| Amplifier Type | J-FET | — |
| Number of Circuits | 4 | — |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) | — |
| Slew Rate | 20 | V/µs |
| Gain Bandwidth Product | 5 | MHz |
| Current - Input Bias | 2 | pA |
| Voltage - Input Offset | 1.5 | mV |
| Current - Supply | 1.2 (x4 Channels) | mA |
| Current - Output / Channel | 27 | mA |
| Voltage - Supply Span (Min) | 8 | V |
| Voltage - Supply Span (Max) | 36 | V |
| Operating Temperature | -40°C ~ 125°C | — |
| Mounting Type | Surface Mount | — |
| Product Status | Active | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitution of the ADTL084ARZ is determined by the following critical parameters:
Primary Substitution Criteria:
- Amplifier Type: J-FET topology required for low input bias current performance
- Number of Circuits: 4-circuit configuration
- Package / Case: 14-SOIC surface mount package
- Slew Rate: Minimum 13 V/µs acceptable
- Gain Bandwidth Product: Minimum 4 MHz acceptable
- Current - Input Bias: Maximum 50 pA acceptable
- Voltage - Input Offset: Maximum 5 mV acceptable
- Voltage - Supply Span: Minimum 7 V to Maximum 36 V required
- Operating Temperature: Minimum -40°C to Maximum 105°C acceptable
- Product Status: Active or Obsolete acceptable; Not For New Designs not recommended for new applications
Secondary Compatibility Factors:
- Current - Supply: Maximum 7.2 mA acceptable
- Current - Output / Channel: Minimum 25 mA acceptable
- Mounting Type: Surface Mount required
- RoHS Compliance: ROHS3 Compliant preferred
Substitute parts meeting these criteria are grouped by amplifier type and circuit configuration. J-FET amplifiers with 4-circuit configurations in 14-SOIC packages are primary substitutes. General Purpose amplifiers with 4-circuit configurations are secondary substitutes when J-FET topology is not available, provided electrical parameters remain within acceptable ranges.
Parameter Comparison
| Parameter | ADTL084ARZ | LF247DT | LF347M | LM224DT | LM324ADT | LM2902YDT |
|---|---|---|---|---|---|---|
| Manufacturer | Analog Devices Inc. | STMicroelectronics | onsemi | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Amplifier Type | J-FET | J-FET | J-FET | General Purpose | General Purpose | General Purpose |
| Number of Circuits | 4 | 4 | 4 | 4 | 4 | 4 |
| Package / Case | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC |
| Slew Rate (V/µs) | 20 | 16 | 13 | 0.4 | 0.4 | 0.4 |
| Gain Bandwidth Product (MHz) | 5 | 4 | 4 | 1.3 | 1.3 | 1.3 |
| Current - Input Bias (pA) | 2 | 20 | 50 | 20 (nA) | 20 (nA) | 20 (nA) |
| Voltage - Input Offset (mV) | 1.5 | 3 | 5 | 2 | 2 | 2 |
| Current - Supply (mA) | 1.2 | 1.4 | 7.2 | 1.5 | 1.5 | 1.5 |
| Current - Output / Channel (mA) | 27 | 40 | Not Specified | 40 | 40 | 60 |
| Voltage - Supply Span Min (V) | 8 | 44 | 7 | 3 | 3 | 3 |
| Voltage - Supply Span Max (V) | 36 | 44 | 36 | 30 | 30 | 30 |
| Operating Temperature (°C) | -40 ~ 125 | -40 ~ 105 | 0 ~ 70 | -40 ~ 105 | 0 ~ 70 | -40 ~ 125 |
| Product Status | Active | Active | Obsolete | Active | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | Not Specified | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Substitutes (J-FET Amplifiers):
LF247DT and LF347M are J-FET amplifiers with 4-circuit configurations in 14-SOIC packages, providing the closest functional equivalence to the ADTL084ARZ. LF247DT is manufactured by STMicroelectronics with Active product status and ROHS3 compliance. LF247DT exhibits slew rate of 16 V/µs and gain bandwidth product of 4 MHz, both within acceptable substitution parameters. Input bias current of 20 pA and input offset voltage of 3 mV are slightly elevated compared to the ADTL084ARZ but remain within substitution limits. LF247DT supports operating temperature range of -40°C to 105°C and supply voltage span of 44 V fixed.
LF347M is manufactured by onsemi with Obsolete product status. This device exhibits slew rate of 13 V/µs and gain bandwidth product of 4 MHz. Input bias current of 50 pA and input offset voltage of 5 mV represent the upper limits of acceptable substitution parameters. Operating temperature range is 0°C to 70°C, which is narrower than the ADTL084ARZ. LF347M is not recommended for new designs due to Obsolete status.
Secondary Substitutes (General Purpose Amplifiers):
LM224DT, LM324ADT, and LM2902YDT are general purpose amplifiers with 4-circuit configurations in 14-SOIC packages. These devices provide functional substitution when J-FET topology is not required. LM224DT and LM324ADT are manufactured by STMicroelectronics with Active product status and ROHS3 compliance. Both devices exhibit slew rate of 0.4 V/µs and gain bandwidth product of 1.3 MHz, representing reduced performance compared to the ADTL084ARZ. Input bias current is specified as 20 nanoamperes (nA), significantly higher than the ADTL084ARZ at 2 picoamperes (pA). Supply voltage span is 3 V to 30 V, which does not accommodate the full 8 V to 36 V range of the ADTL084ARZ.
LM2902YDT is manufactured by STMicroelectronics with Active product status, ROHS3 compliance, and AEC-Q100 automotive qualification. This device exhibits slew rate of 0.4 V/µs and gain bandwidth product of 1.3 MHz. Output current per channel is 60 mA, exceeding the ADTL084ARZ specification. Operating temperature range is -40°C to 125°C, matching the ADTL084ARZ. Supply voltage span is 3 V to 30 V.
Compliance and Certification:
All recommended primary and secondary substitutes maintain ROHS3 compliance and REACH Unaffected status, consistent with the ADTL084ARZ. LM2902YDT includes AEC-Q100 automotive qualification for applications requiring automotive-grade components.
Frequently Asked Questions (FAQ)
Q: Can the LF247DT directly replace the ADTL084ARZ in all applications?
A: LF247DT is a J-FET amplifier with 4-circuit configuration in a 14-SOIC package, providing direct functional substitution. However, the fixed supply voltage span of 44 V differs from the ADTL084ARZ range of 8 V to 36 V. Verify that your application circuit accommodates this supply voltage specification. Input bias current of 20 pA is 10 times higher than the ADTL084ARZ; applications requiring ultra-low input bias current may require circuit redesign.
Q: What is the difference between J-FET and General Purpose amplifier types?
A: J-FET amplifiers feature junction field-effect transistor input stages, providing extremely low input bias current (picoampere range) and high input impedance. General Purpose amplifiers typically use bipolar input stages with higher input bias current (nanoampere range) but lower cost and simpler biasing requirements. The ADTL084ARZ is a J-FET amplifier; substitution with General Purpose amplifiers is acceptable only when low input bias current is not a critical design requirement.
Q: Are LM224DT and LM324ADT interchangeable?
A: LM224DT and LM324ADT are both general purpose 4-circuit amplifiers in 14-SOIC packages manufactured by STMicroelectronics with identical electrical specifications. The primary difference is operating temperature range: LM224DT operates from -40°C to 105°C, while LM324ADT operates from 0°C to 70°C. Select LM224DT for extended temperature applications and LM324ADT for standard industrial temperature ranges.
Q: Why is LF347M listed as Obsolete?
A: LF347M is classified as Obsolete product status by onsemi, indicating that the manufacturer no longer actively produces this device. While inventory may remain available, long-term supply cannot be guaranteed. For new designs, LF247DT is the recommended J-FET substitute. LF347M may be used only for legacy system maintenance or repair applications where supply continuity is not a concern.
Q: What is the significance of the 14-SOIC package specification?
A: The 14-SOIC (Small Outline Integrated Circuit) package is a surface mount package with 0.154 inches (3.90 mm) width. All listed substitute parts use identical 14-SOIC packaging, ensuring mechanical and electrical compatibility with printed circuit board layouts designed for the ADTL084ARZ. Package compatibility eliminates the need for circuit board redesign.
Q: Can I use LM2902YDT in automotive applications?
A: LM2902YDT includes AEC-Q100 automotive qualification, making it suitable for automotive-grade applications. However, the ADTL084ARZ does not specify automotive qualification. If your application requires automotive-grade components, LM2902YDT is the appropriate substitute. Verify that the reduced slew rate (0.4 V/µs versus 20 V/µs) and gain bandwidth product (1.3 MHz versus 5 MHz) meet your circuit performance requirements.
Q: What is the impact of input offset voltage differences on circuit performance?
A: Input offset voltage is the DC voltage difference between the two input terminals when the output is zero. The ADTL084ARZ specifies 1.5 mV maximum input offset voltage. Substitute parts range from 1 mV to 5 mV. Higher input offset voltage may require increased DC offset trimming in precision applications. For general-purpose applications, these differences are typically negligible. For precision instrumentation, measure the actual input offset voltage of the substitute part and adjust circuit compensation accordingly.
Q: How do slew rate differences affect circuit performance?
A: Slew rate is the maximum rate of change of output voltage per unit time. The ADTL084ARZ specifies 20 V/µs slew rate. J-FET substitutes (LF247DT at 16 V/µs, LF347M at 13 V/µs) provide reduced slew rate. General Purpose substitutes (0.4 V/µs) provide significantly reduced slew rate. Lower slew rate limits the maximum frequency and amplitude of output signal changes. For high-frequency or high-speed applications, verify that substitute part slew rate is adequate for your circuit bandwidth requirements.
Q: What inventory considerations should I evaluate?
A: Inventory availability varies significantly among substitute parts. LM224DT and LM324DT show highest inventory levels (35,200 and 405,100 units respectively), ensuring long-term supply availability. LF247DT shows 17,352 units in stock. LF347M shows 1,448 units with Obsolete status. For production applications requiring sustained supply, prioritize parts with higher inventory levels and Active product status.
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